Lulzbot TAZ Z NUT Spring for 10x2 Acme Threaded Rods

This is a remix of http://www.thingiverse.com/thing:194051 for acme nuts 17.6mm across the flats. The one in white is the old spring and the ones in black are the new ones. I had to sand off a bit on my motor and idler ends for the bigger acme rod

the rods are from mcmaster carr
http://www.mcmaster.com/#catalog/120/1123/=qj61m6

nuts from ebay
http://www.ebay.com/itm/131098930278?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649